The Luton is a van/truck that was never released in Grand Theft Auto III but is featured on the Capital Autos website and in some very early screenshots.[1].[1] Its cargo box is very similar to that of the Mule, but it resembles a European 1986-1994 Ford Transit rather than an American Ford E-Series (like the Mule). It can be assumed the Luton is a predecessor of the Mule, given both vehicles share this design trait.

The name is presumably taken from "luton", a European terminology for a box truck with an overhanging peak, which the Luton and the Mule feature.